added colours to qf extension to distinguish quickfix and location list (#933)

* added colours to qf extension to distinguish quickfix and location list

* renamed M.init() more properly

* decoupling colours assignments from init method

lua/lualine/extensions/quickfix.lua

@@ -16,6 +16,11 @@ local function title()
   return vim.fn.getqflist({ title = 0 }).title
 end
 
+local qf_colours = {
+  ll = vim.api.nvim_get_hl_by_name('Constant', false).foreground,
+  qf = vim.api.nvim_get_hl_by_name('Identifier', false).foreground,
+}
+
 local M = {}
 
 function M.init()
@@ -24,7 +29,14 @@ function M.init()
 end
 
 M.sections = {
-  lualine_a = { label },
+  lualine_a = {
+    {
+      label,
+      color = function()
+        return is_loclist() and { bg = qf_colours['ll'] } or { bg = qf_colours['qf'] }
+      end,
+    },
+  },
   lualine_b = { title },
   lualine_z = { 'location' },
 }